<?php
/**
 * Smarty Internal Plugin Smarty Template  Base
 *
 * This file contains the basic shared methodes for template handling
 *
 * @package Smarty
 * @subpackage Template
 * @author Uwe Tews
 */

/**
 * Class with shared template methodes
 *
 * @package Smarty
 * @subpackage Template
 */
abstract class Smarty_Internal_TemplateBase extends Smarty_Internal_Data {
	
	/**
	 * fetches a rendered Smarty template
	 *
	 * @param $template string
	 *       	 the resource handle of the template file or template object
	 * @param $cache_id mixed
	 *       	 cache id to be used with this template
	 * @param $compile_id mixed
	 *       	 compile id to be used with this template
	 * @param $parent object
	 *       	 next higher level of Smarty variables
	 * @param $display bool
	 *       	 true: display, false: fetch
	 * @param $merge_tpl_vars bool
	 *       	 if true parent template variables merged in to local scope
	 * @param $no_output_filter bool
	 *       	 if true do not run output filter
	 * @return string rendered template output
	 */
	public function fetch($template = null, $cache_id = null, $compile_id = null, $parent = null, $display = false, $merge_tpl_vars = true, $no_output_filter = false) {
		if ($template === null && $this instanceof $this->template_class) {
			$template = $this;
		}
		if (! empty ( $cache_id ) && is_object ( $cache_id )) {
			$parent = $cache_id;
			$cache_id = null;
		}
		if ($parent === null && ($this instanceof Smarty || is_string ( $template ))) {
			$parent = $this;
		}
		// create template object if necessary
		$_template = ($template instanceof $this->template_class) ? $template : $this->smarty->createTemplate ( $template, $cache_id, $compile_id, $parent, false );
		// if called by Smarty object make sure we use current caching status
		if ($this instanceof Smarty) {
			$_template->caching = $this->caching;
		}
		// merge all variable scopes into template
		if ($merge_tpl_vars) {
			// save local variables
			$save_tpl_vars = $_template->tpl_vars;
			$save_config_vars = $_template->config_vars;
			$ptr_array = array ($_template );
			$ptr = $_template;
			while ( isset ( $ptr->parent ) ) {
				$ptr_array [] = $ptr = $ptr->parent;
			}
			$ptr_array = array_reverse ( $ptr_array );
			$parent_ptr = reset ( $ptr_array );
			$tpl_vars = $parent_ptr->tpl_vars;
			$config_vars = $parent_ptr->config_vars;
			while ( $parent_ptr = next ( $ptr_array ) ) {
				if (! empty ( $parent_ptr->tpl_vars )) {
					$tpl_vars = array_merge ( $tpl_vars, $parent_ptr->tpl_vars );
				}
				if (! empty ( $parent_ptr->config_vars )) {
					$config_vars = array_merge ( $config_vars, $parent_ptr->config_vars );
				}
			}
			if (! empty ( Smarty::$global_tpl_vars )) {
				$tpl_vars = array_merge ( Smarty::$global_tpl_vars, $tpl_vars );
			}
			$_template->tpl_vars = $tpl_vars;
			$_template->config_vars = $config_vars;
		}
		// dummy local smarty variable
		if (! isset ( $_template->tpl_vars ['smarty'] )) {
			$_template->tpl_vars ['smarty'] = new Smarty_Variable ();
		}
		if (isset ( $this->smarty->error_reporting )) {
			$_smarty_old_error_level = error_reporting ( $this->smarty->error_reporting );
		}
		// check URL debugging control
		if (! $this->smarty->debugging && $this->smarty->debugging_ctrl == 'URL') {
			if (isset ( $_SERVER ['QUERY_STRING'] )) {
				$_query_string = $_SERVER ['QUERY_STRING'];
			} else {
				$_query_string = '';
			}
			if (false !== strpos ( $_query_string, $this->smarty->smarty_debug_id )) {
				if (false !== strpos ( $_query_string, $this->smarty->smarty_debug_id . '=on' )) {
					// enable debugging for this browser session
					setcookie ( 'SMARTY_DEBUG', true );
					$this->smarty->debugging = true;
				} elseif (false !== strpos ( $_query_string, $this->smarty->smarty_debug_id . '=off' )) {
					// disable debugging for this browser session
					setcookie ( 'SMARTY_DEBUG', false );
					$this->smarty->debugging = false;
				} else {
					// enable debugging for this page
					$this->smarty->debugging = true;
				}
			} else {
				if (isset ( $_COOKIE ['SMARTY_DEBUG'] )) {
					$this->smarty->debugging = true;
				}
			}
		}
		// must reset merge template date
		$_template->smarty->merged_templates_func = array ();
		// get rendered template
		// disable caching for evaluated code
		if ($_template->source->recompiled) {
			$_template->caching = false;
		}
		// checks if template exists
		if (! $_template->source->exists) {
			if ($_template->parent instanceof Smarty_Internal_Template) {
				$parent_resource = " in '{$_template->parent->template_resource}'";
			} else {
				$parent_resource = '';
			}
			throw new SmartyException ( "Unable to load template {$_template->source->type} '{$_template->source->name}'{$parent_resource}" );
		}
		// read from cache or render
		if (! ($_template->caching == Smarty::CACHING_LIFETIME_CURRENT || $_template->caching == Smarty::CACHING_LIFETIME_SAVED) || ! $_template->cached->valid) {
			// render template (not loaded and not in cache)
			if (! $_template->source->uncompiled) {
				$_smarty_tpl = $_template;
				if ($_template->source->recompiled) {
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_compile ( $_template );
					}
					$code = $_template->compiler->compileTemplate ( $_template );
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::end_compile ( $_template );
					}
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render ( $_template );
					}
					try {
						ob_start ();
						eval ( "?>" . $code );
						unset ( $code );
					} catch ( Exception $e ) {
						ob_get_clean ();
						throw $e;
					}
				} else {
					if (! $_template->compiled->exists || ($_template->smarty->force_compile && ! $_template->compiled->isCompiled)) {
						$_template->compileTemplateSource ();
					}
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render ( $_template );
					}
					if (! $_template->compiled->loaded) {
						include ($_template->compiled->filepath);
						if ($_template->mustCompile) {
							// recompile and load again
							$_template->compileTemplateSource ();
							include ($_template->compiled->filepath);
						}
						$_template->compiled->loaded = true;
					} else {
						$_template->decodeProperties ( $_template->compiled->_properties, false );
					}
					try {
						ob_start ();
						if (empty ( $_template->properties ['unifunc'] ) || ! is_callable ( $_template->properties ['unifunc'] )) {
							throw new SmartyException ( "Invalid compiled template for '{$_template->template_resource}'" );
						}
						array_unshift ( $_template->_capture_stack, array () );
						//
						// render compiled template
						//
						$_template->properties ['unifunc'] ( $_template );
						// any unclosed {capture} tags ?
						if (isset ( $_template->_capture_stack [0] [0] )) {
							$_template->capture_error ();
						}
						array_shift ( $_template->_capture_stack );
					} catch ( Exception $e ) {
						ob_get_clean ();
						throw $e;
					}
				}
			} else {
				if ($_template->source->uncompiled) {
					if ($this->smarty->debugging) {
						Smarty_Internal_Debug::start_render ( $_template );
					}
					try {
						ob_start ();
						$_template->source->renderUncompiled ( $_template );
					} catch ( Exception $e ) {
						ob_get_clean ();
						throw $e;
					}
				} else {
					throw new SmartyException ( "Resource '$_template->source->type' must have 'renderUncompiled' method" );
				}
			}
			$_output = ob_get_clean ();
			if (! $_template->source->recompiled && empty ( $_template->properties ['file_dependency'] [$_template->source->uid] )) {
				$_template->properties ['file_dependency'] [$_template->source->uid] = array ($_template->source->filepath, $_template->source->timestamp, $_template->source->type );
			}
			if ($_template->parent instanceof Smarty_Internal_Template) {
				$_template->parent->properties ['file_dependency'] = array_merge ( $_template->parent->properties ['file_dependency'], $_template->properties ['file_dependency'] );
				foreach ( $_template->required_plugins as $code => $tmp1 ) {
					foreach ( $tmp1 as $name => $tmp ) {
						foreach ( $tmp as $type => $data ) {
							$_template->parent->required_plugins [$code] [$name] [$type] = $data;
						}
					}
				}
			}
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::end_render ( $_template );
			}
			// write to cache when nessecary
			if (! $_template->source->recompiled && ($_template->caching == Smarty::CACHING_LIFETIME_SAVED || $_template->caching == Smarty::CACHING_LIFETIME_CURRENT)) {
				if ($this->smarty->debugging) {
					Smarty_Internal_Debug::start_cache ( $_template );
				}
				$_template->properties ['has_nocache_code'] = false;
				// get text between non-cached items
				$cache_split = preg_split ( "!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $_output );
				// get non-cached items
				preg_match_all ( "!/\*%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*\/(.+?)/\*/%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!s", $_output, $cache_parts );
				$output = '';
				// loop over items, stitch back together
				foreach ( $cache_split as $curr_idx => $curr_split ) {
					// escape PHP tags in template content
					$output .= preg_replace ( '/(<%|%>|<\?php|<\?|\?>)/', '<?php echo \'$1\'; ?>', $curr_split );
					if (isset ( $cache_parts [0] [$curr_idx] )) {
						$_template->properties ['has_nocache_code'] = true;
						// remove nocache tags from cache output
						$output .= preg_replace ( "!/\*/?%%SmartyNocache:{$_template->properties['nocache_hash']}%%\*/!", '', $cache_parts [0] [$curr_idx] );
					}
				}
				if (! $no_output_filter && (isset ( $this->smarty->autoload_filters ['output'] ) || isset ( $this->smarty->registered_filters ['output'] ))) {
					$output = Smarty_Internal_Filter_Handler::runFilter ( 'output', $output, $_template );
				}
				// rendering (must be done before writing cache file because of
				// {function} nocache handling)
				$_smarty_tpl = $_template;
				try {
					ob_start ();
					eval ( "?>" . $output );
					$_output = ob_get_clean ();
				} catch ( Exception $e ) {
					ob_get_clean ();
					throw $e;
				}
				// write cache file content
				$_template->writeCachedContent ( $output );
				if ($this->smarty->debugging) {
					Smarty_Internal_Debug::end_cache ( $_template );
				}
			} else {
				// var_dump('renderTemplate', $_template->has_nocache_code,
				// $_template->template_resource,
				// $_template->properties['nocache_hash'],
				// $_template->parent->properties['nocache_hash'], $_output);
				if (! empty ( $_template->properties ['nocache_hash'] ) && ! empty ( $_template->parent->properties ['nocache_hash'] )) {
					// replace nocache_hash
					$_output = preg_replace ( "/{$_template->properties['nocache_hash']}/", $_template->parent->properties ['nocache_hash'], $_output );
					$_template->parent->has_nocache_code = $_template->parent->has_nocache_code || $_template->has_nocache_code;
				}
			}
		} else {
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::start_cache ( $_template );
			}
			try {
				ob_start ();
				array_unshift ( $_template->_capture_stack, array () );
				//
				// render cached template
				//
				$_template->properties ['unifunc'] ( $_template );
				// any unclosed {capture} tags ?
				if (isset ( $_template->_capture_stack [0] [0] )) {
					$_template->capture_error ();
				}
				array_shift ( $_template->_capture_stack );
				$_output = ob_get_clean ();
			} catch ( Exception $e ) {
				ob_get_clean ();
				throw $e;
			}
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::end_cache ( $_template );
			}
		}
		if ((! $this->caching || $_template->source->recompiled) && ! $no_output_filter && (isset ( $this->smarty->autoload_filters ['output'] ) || isset ( $this->smarty->registered_filters ['output'] ))) {
			$_output = Smarty_Internal_Filter_Handler::runFilter ( 'output', $_output, $_template );
		}
		if (isset ( $this->error_reporting )) {
			error_reporting ( $_smarty_old_error_level );
		}
		// display or fetch
		if ($display) {
			if ($this->caching && $this->cache_modified_check) {
				$_isCached = $_template->isCached () && ! $_template->has_nocache_code;
				$_last_modified_date = @substr ( $_SERVER ['HTTP_IF_MODIFIED_SINCE'], 0, strpos ( $_SERVER ['HTTP_IF_MODIFIED_SINCE'], 'GMT' ) + 3 );
				if ($_isCached && $_template->cached->timestamp <= strtotime ( $_last_modified_date )) {
					switch (PHP_SAPI) {
						case 'cgi' : // php-cgi < 5.3
						case 'cgi-fcgi' : // php-cgi >= 5.3
						case 'fpm-fcgi' : // php-fpm >= 5.3.3
							header ( 'Status: 304 Not Modified' );
							break;
						
						case 'cli' :
							if (/* ^phpunit */! empty ( $_SERVER ['SMARTY_PHPUNIT_DISABLE_HEADERS'] )/* phpunit$ */) {
								$_SERVER ['SMARTY_PHPUNIT_HEADERS'] [] = '304 Not Modified';
							}
							break;
						
						default :
							header ( 'HTTP/1.1 304 Not Modified' );
							break;
					}
				} else {
					switch (PHP_SAPI) {
						case 'cli' :
							if (/* ^phpunit */! empty ( $_SERVER ['SMARTY_PHPUNIT_DISABLE_HEADERS'] )/* phpunit$ */) {
								$_SERVER ['SMARTY_PHPUNIT_HEADERS'] [] = 'Last-Modified: ' . gmdate ( 'D, d M Y H:i:s', $_template->cached->timestamp ) . ' GMT';
							}
							break;
						
						default :
							header ( 'Last-Modified: ' . gmdate ( 'D, d M Y H:i:s', $_template->cached->timestamp ) . ' GMT' );
							break;
					}
					echo $_output;
				}
			} else {
				echo $_output;
			}
			// debug output
			if ($this->smarty->debugging) {
				Smarty_Internal_Debug::display_debug ( $this );
			}
			if ($merge_tpl_vars) {
				// restore local variables
				$_template->tpl_vars = $save_tpl_vars;
				$_template->config_vars = $save_config_vars;
			}
			return;
		} else {
			if ($merge_tpl_vars) {
				// restore local variables
				$_template->tpl_vars = $save_tpl_vars;
				$_template->config_vars = $save_config_vars;
			}
			// return fetched content
			return $_output;
		}
	}
	
	/**
	 * displays a Smarty template
	 *
	 * @param $template string
	 *       	 the resource handle of the template file or template object
	 * @param $cache_id mixed
	 *       	 cache id to be used with this template
	 * @param $compile_id mixed
	 *       	 compile id to be used with this template
	 * @param $parent object
	 *       	 next higher level of Smarty variables
	 */
	public function display($template = null, $cache_id = null, $compile_id = null, $parent = null) {
		// display template
		$this->fetch ( $template, $cache_id, $compile_id, $parent, true );
	}
	
	/**
	 * test if cache is valid
	 *
	 * @param $template string|object
	 *       	 the resource handle of the template file or template object
	 * @param $cache_id mixed
	 *       	 cache id to be used with this template
	 * @param $compile_id mixed
	 *       	 compile id to be used with this template
	 * @param $parent object
	 *       	 next higher level of Smarty variables
	 * @return boolean cache status
	 */
	public function isCached($template = null, $cache_id = null, $compile_id = null, $parent = null) {
		if ($template === null && $this instanceof $this->template_class) {
			return $this->cached->valid;
		}
		if (! ($template instanceof $this->template_class)) {
			if ($parent === null) {
				$parent = $this;
			}
			$template = $this->smarty->createTemplate ( $template, $cache_id, $compile_id, $parent, false );
		}
		// return cache status of template
		return $template->cached->valid;
	}
	
	/**
	 * creates a data object
	 *
	 * @param $parent object
	 *       	 next higher level of Smarty variables
	 * @return s Smarty_Data data object
	 */
	public function createData($parent = null) {
		return new Smarty_Data ( $parent, $this );
	}
	
	/**
	 * Registers plugin to be used in templates
	 *
	 * @param $type string
	 *       	 plugin type
	 * @param $tag string
	 *       	 name of template tag
	 * @param $callback callback
	 *       	 PHP callback to register
	 * @param $cacheable boolean
	 *       	 if true (default) this fuction is cachable
	 * @param $cache_attr array
	 *       	 caching attributes if any
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException when the plugin tag is invalid
	 */
	public function registerPlugin($type, $tag, $callback, $cacheable = true, $cache_attr = null) {
		if (isset ( $this->smarty->registered_plugins [$type] [$tag] )) {
			throw new SmartyException ( "Plugin tag \"{$tag}\" already registered" );
		} elseif (! is_callable ( $callback )) {
			throw new SmartyException ( "Plugin \"{$tag}\" not callable" );
		} else {
			$this->smarty->registered_plugins [$type] [$tag] = array ($callback, ( bool ) $cacheable, ( array ) $cache_attr );
		}
		
		return $this;
	}
	
	/**
	 * Unregister Plugin
	 *
	 * @param $type string
	 *       	 of plugin
	 * @param $tag string
	 *       	 name of plugin
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterPlugin($type, $tag) {
		if (isset ( $this->smarty->registered_plugins [$type] [$tag] )) {
			unset ( $this->smarty->registered_plugins [$type] [$tag] );
		}
		
		return $this;
	}
	
	/**
	 * Registers a resource to fetch a template
	 *
	 * @param $type string
	 *       	 name of resource type
	 * @param $callback Smarty_Resource|array
	 *       	 or instance of Smarty_Resource, or array of callbacks to
	 *        	handle resource (deprecated)
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerResource($type, $callback) {
		$this->smarty->registered_resources [$type] = $callback instanceof Smarty_Resource ? $callback : array ($callback, false );
		return $this;
	}
	
	/**
	 * Unregisters a resource
	 *
	 * @param $type string
	 *       	 name of resource type
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterResource($type) {
		if (isset ( $this->smarty->registered_resources [$type] )) {
			unset ( $this->smarty->registered_resources [$type] );
		}
		
		return $this;
	}
	
	/**
	 * Registers a cache resource to cache a template's output
	 *
	 * @param $type string
	 *       	 name of cache resource type
	 * @param $callback Smarty_CacheResource
	 *       	 instance of Smarty_CacheResource to handle output caching
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerCacheResource($type, Smarty_CacheResource $callback) {
		$this->smarty->registered_cache_resources [$type] = $callback;
		return $this;
	}
	
	/**
	 * Unregisters a cache resource
	 *
	 * @param $type string
	 *       	 name of cache resource type
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterCacheResource($type) {
		if (isset ( $this->smarty->registered_cache_resources [$type] )) {
			unset ( $this->smarty->registered_cache_resources [$type] );
		}
		
		return $this;
	}
	
	/**
	 * Registers object to be used in templates
	 *
	 * @param $object string
	 *       	 name of template object
	 * @param $object_impl object
	 *       	 the referenced PHP object to register
	 * @param $allowed array
	 *       	 list of allowed methods (empty = all)
	 * @param $smarty_args boolean
	 *       	 smarty argument format, else traditional
	 * @param $block_methods array
	 *       	 list of block-methods
	 * @param $block_functs array
	 *       	 list of methods that are block format
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if any of the methods in $allowed or
	 *         $block_methods are invalid
	 */
	public function registerObject($object_name, $object_impl, $allowed = array(), $smarty_args = true, $block_methods = array()) {
		// test if allowed methodes callable
		if (! empty ( $allowed )) {
			foreach ( ( array ) $allowed as $method ) {
				if (! is_callable ( array ($object_impl, $method ) )) {
					throw new SmartyException ( "Undefined method '$method' in registered object" );
				}
			}
		}
		// test if block methodes callable
		if (! empty ( $block_methods )) {
			foreach ( ( array ) $block_methods as $method ) {
				if (! is_callable ( array ($object_impl, $method ) )) {
					throw new SmartyException ( "Undefined method '$method' in registered object" );
				}
			}
		}
		// register the object
		$this->smarty->registered_objects [$object_name] = array ($object_impl, ( array ) $allowed, ( boolean ) $smarty_args, ( array ) $block_methods );
		return $this;
	}
	
	/**
	 * return a reference to a registered object
	 *
	 * @param $name string
	 *       	 object name
	 * @return object
	 * @throws SmartyException if no such object is found
	 */
	public function getRegisteredObject($name) {
		if (! isset ( $this->smarty->registered_objects [$name] )) {
			throw new SmartyException ( "'$name' is not a registered object" );
		}
		if (! is_object ( $this->smarty->registered_objects [$name] [0] )) {
			throw new SmartyException ( "registered '$name' is not an object" );
		}
		return $this->smarty->registered_objects [$name] [0];
	}
	
	/**
	 * unregister an object
	 *
	 * @param $name string
	 *       	 object name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterObject($name) {
		if (isset ( $this->smarty->registered_objects [$name] )) {
			unset ( $this->smarty->registered_objects [$name] );
		}
		
		return $this;
	}
	
	/**
	 * Registers static classes to be used in templates
	 *
	 * @param $class string
	 *       	 name of template class
	 * @param $class_impl string
	 *       	 the referenced PHP class to register
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $class_impl does not refer to an existing
	 *         class
	 */
	public function registerClass($class_name, $class_impl) {
		// test if exists
		if (! class_exists ( $class_impl )) {
			throw new SmartyException ( "Undefined class '$class_impl' in register template class" );
		}
		// register the class
		$this->smarty->registered_classes [$class_name] = $class_impl;
		return $this;
	}
	
	/**
	 * Registers a default plugin handler
	 *
	 * @param $callback callable
	 *       	 class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultPluginHandler($callback) {
		if (is_callable ( $callback )) {
			$this->smarty->default_plugin_handler_func = $callback;
		} else {
			throw new SmartyException ( "Default plugin handler '$callback' not callable" );
		}
		
		return $this;
	}
	
	/**
	 * Registers a default template handler
	 *
	 * @param $callback callable
	 *       	 class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultTemplateHandler($callback) {
		if (is_callable ( $callback )) {
			$this->smarty->default_template_handler_func = $callback;
		} else {
			throw new SmartyException ( "Default template handler '$callback' not callable" );
		}
		
		return $this;
	}
	
	/**
	 * Registers a default template handler
	 *
	 * @param $callback callable
	 *       	 class/method name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 * @throws SmartyException if $callback is not callable
	 */
	public function registerDefaultConfigHandler($callback) {
		if (is_callable ( $callback )) {
			$this->smarty->default_config_handler_func = $callback;
		} else {
			throw new SmartyException ( "Default config handler '$callback' not callable" );
		}
		
		return $this;
	}
	
	/**
	 * Registers a filter function
	 *
	 * @param $type string
	 *       	 filter type
	 * @param $callback callback       	
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function registerFilter($type, $callback) {
		$this->smarty->registered_filters [$type] [$this->_get_filter_name ( $callback )] = $callback;
		return $this;
	}
	
	/**
	 * Unregisters a filter function
	 *
	 * @param $type string
	 *       	 filter type
	 * @param $callback callback       	
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unregisterFilter($type, $callback) {
		$name = $this->_get_filter_name ( $callback );
		if (isset ( $this->smarty->registered_filters [$type] [$name] )) {
			unset ( $this->smarty->registered_filters [$type] [$name] );
		}
		
		return $this;
	}
	
	/**
	 * Return internal filter name
	 *
	 * @param $function_name callback       	
	 * @return string internal filter name
	 */
	public function _get_filter_name($function_name) {
		if (is_array ( $function_name )) {
			$_class_name = (is_object ( $function_name [0] ) ? get_class ( $function_name [0] ) : $function_name [0]);
			return $_class_name . '_' . $function_name [1];
		} else {
			return $function_name;
		}
	}
	
	/**
	 * load a filter of specified type and name
	 *
	 * @param $type string
	 *       	 filter type
	 * @param $name string
	 *       	 filter name
	 * @throws SmartyException if filter could not be loaded
	 */
	public function loadFilter($type, $name) {
		$_plugin = "smarty_{$type}filter_{$name}";
		$_filter_name = $_plugin;
		if ($this->smarty->loadPlugin ( $_plugin )) {
			if (class_exists ( $_plugin, false )) {
				$_plugin = array ($_plugin, 'execute' );
			}
			if (is_callable ( $_plugin )) {
				$this->smarty->registered_filters [$type] [$_filter_name] = $_plugin;
				return true;
			}
		}
		throw new SmartyException ( "{$type}filter \"{$name}\" not callable" );
	}
	
	/**
	 * unload a filter of specified type and name
	 *
	 * @param $type string
	 *       	 filter type
	 * @param $name string
	 *       	 filter name
	 * @return Smarty_Internal_Templatebase current Smarty_Internal_Templatebase
	 *         (or Smarty or Smarty_Internal_Template) instance for chaining
	 */
	public function unloadFilter($type, $name) {
		$_filter_name = "smarty_{$type}filter_{$name}";
		if (isset ( $this->smarty->registered_filters [$type] [$_filter_name] )) {
			unset ( $this->smarty->registered_filters [$type] [$_filter_name] );
		}
		
		return $this;
	}
	
	/**
	 * preg_replace callback to convert camelcase getter/setter to underscore
	 * property names
	 *
	 * @param $match string
	 *       	 match string
	 * @return string replacemant
	 */
	private function replaceCamelcase($match) {
		return "_" . strtolower ( $match [1] );
	}
	
	/**
	 * Handle unknown class methods
	 *
	 * @param $name string
	 *       	 unknown method-name
	 * @param $args array
	 *       	 argument array
	 */
	public function __call($name, $args) {
		static $_prefixes = array ('set' => true, 'get' => true );
		static $_resolved_property_name = array ();
		static $_resolved_property_source = array ();
		
		// method of Smarty object?
		if (method_exists ( $this->smarty, $name )) {
			return call_user_func_array ( array ($this->smarty, $name ), $args );
		}
		// see if this is a set/get for a property
		$first3 = strtolower ( substr ( $name, 0, 3 ) );
		if (isset ( $_prefixes [$first3] ) && isset ( $name [3] ) && $name [3] !== '_') {
			if (isset ( $_resolved_property_name [$name] )) {
				$property_name = $_resolved_property_name [$name];
			} else {
				// try to keep case correct for future PHP 6.0 case-sensitive
				// class methods
				// lcfirst() not available < PHP 5.3.0, so improvise
				$property_name = strtolower ( substr ( $name, 3, 1 ) ) . substr ( $name, 4 );
				// convert camel case to underscored name
				$property_name = preg_replace_callback ( '/([A-Z])/', array ($this, 'replaceCamelcase' ), $property_name );
				$_resolved_property_name [$name] = $property_name;
			}
			if (isset ( $_resolved_property_source [$property_name] )) {
				$_is_this = $_resolved_property_source [$property_name];
			} else {
				$_is_this = null;
				if (property_exists ( $this, $property_name )) {
					$_is_this = true;
				} else if (property_exists ( $this->smarty, $property_name )) {
					$_is_this = false;
				}
				$_resolved_property_source [$property_name] = $_is_this;
			}
			if ($_is_this) {
				if ($first3 == 'get')
					return $this->$property_name;
				else
					return $this->$property_name = $args [0];
			} else if ($_is_this === false) {
				if ($first3 == 'get')
					return $this->smarty->$property_name;
				else
					return $this->smarty->$property_name = $args [0];
			} else {
				throw new SmartyException ( "property '$property_name' does not exist." );
				return false;
			}
		}
		if ($name == 'Smarty') {
			throw new SmartyException ( "PHP5 requires you to call __construct() instead of Smarty()" );
		}
		// must be unknown
		throw new SmartyException ( "Call of unknown method '$name'." );
	}

}

?>